Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2011-07-12
2011-07-12
Vo, Tim T. (Department: 2168)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C707S624000
Reexamination Certificate
active
07979654
ABSTRACT:
A system for synchronizing a secondary volume with a primary volume in a continuous data protection system includes scanning means for scanning a region of the primary volume; comparing means for comparing the scanned region with a corresponding region of the secondary volume; storing means for storing an identification of the scanned region in a compare delta map when the comparing means returns a discrepancy between the scanned region and the corresponding region; copying means for copying data from the primary volume to the secondary volume, using the compare delta map as a guide to locate the data to copy; and revising means for revising the compare delta map by removing any changes made to the primary volume during a scan interval, which is a period of time required to scan the primary volume.
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Blaser Rico
Chang Yafen Peggy
Johnson Randall
Johnston Craig Anthony
Saxena Pawan
Meng Jau-Shya
NetApp, Inc.
Perkins Coie LLP
Vo Tim T.
LandOfFree
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